Heat and low-water indicator



O. H. LUDEMAN.

HEAT AND LOW WATER INDICATOR.

APPLICATION FILED DEC.9. 1918.

1,390,532. PatentedSept. 13,1921.

[/7 var/far Afr neg OSCAR H. LUDEMAN, OF HARTFORD, CONNECTICUT.

near Aim LOW-WATER INDICATOR.

Specification of Letters Patent.

Patented Sept. 13, 1921.

Application filed December 9, 1918. Serial No. 265,998.

To a?! uhom'z't may concern:

Be it known that I, Osoan H. LUDEMAN, a citizen of the United States, and a resident of Hartford, in the county of Hartford and State of Connecticut, have invented a new and Improved Heat. and Lowater Indicator, of which the following is a specification.

My invention relates to the class of devices employed to denote abnormal low water andexcessive heat conditions in water reservoirs. and an object of my invention, among others. is to provide a device of this class that shall be simple in construction and effective in operation.

One form of device embodying my invention and in the construction and use of which the objects herein set out, as well as others, may be attained, is illustrated in the accompanying drawings, in which- T h figure is a view in central longitudinal section through my improved indicator and through a portion of an automobile radiator.

\Vhile my invention is not limited to use in connection with reservoirs designed for any special use, yet, as it is particularly adapted for use in connection with automobile radiators, I have selected such a reservoir for the purpose of illustrating and describing my invention herein, in such drawings the numeral 5 denoting a portion of an automobile radiator of any desired form and construction and having tubes 6-7 extending therefrom and connected with a case 4 of my improved indicator. This case may be of any suitable form, that herein shown being round in cross section, and it will receive through the tubes 6-7 the fluid contents of the automobile radiator, said case being located at such height that the water will not flow out at the top thereof. A float 8 is located within the case with a float rod 9 projecting therefrom through the top of the case. As herein shown this rod projects through an extension 10 from a'cap 11 removably secured to the case: A movable contact 12 is secured to'the upper end of the rod 9 in position to touch a stationary contact 13 secured to an insulating block 14 on the cap 11.

An indicator, preferably audible, and shown herein as a buzzer 15, is secured to the side of the case 4, one terminal 16 being electrically connected by a wire 17 with the stationary contact 13. The other terminal 18 of the buzzer is connected as by wire 19 with one pole of a battery 20, the other pole of said battery being connected as by a wire 21 with the case that forms a ground therefor.

A thermostatic bar 22 is secured to the insideof the case, preferably to the cap 11, and pro ects so that one end overlies the float 8 in position to press against the same as the bar changes its shape. in a wellv known manner. under conditions of requisite heat.-

From the above description taken in connection with the accompanying drawings it will be noted that when the water in the radiator is lowered to a predetermined degree, the downward movement of the float caused thereby will cause the movable contact 12 to engage the stationary contact 13, thereby closing the electric circuit and setting the buzzer in operation, thus indicating that th water has reached such level as to require replenishing.

In many instances an excessive heat may take place in the water in the radiator without its lowering excessively, and in such cases the thermostatic shape of bar 22 will be changed sufficiently to touch the float and press it downwardly in the water and thereby bring the movable contact 12 into engagement with the contact 13 and thus sound the alarm as before.

The indicator is illustrated herein as an audibl indicator, but it will be understood that it may be of any type, and so long as it denotes in any manner the conditions hereindescrihed as to the radiator, it will answer the requirements of the invention and the thermostat may be of any of the well known forms.

In accordance with the provisions of the patent statutes, I have described the principles of operation of my invention, together with the device which now consider to represent th best embodiment thereof; but I desire to have it understood that the device shown is only illustrative, and that. the invention may be carried out by other means.

I claim- 1. An operating mechanism fora low water and heat indicator including a case adapted to be connected with aholder to receive liquid therefrom, a float with'yn the case, means actuated by the float to set an indicator in operation at a predetermined position of the float, and a thermostat positioned to move said float.

2. An operating mechanism for a low water and heat indicator including a case adapted to be connected-With a holder to receive liquid therefrom, a float Within the case, means actuated by the float to set an indicator in peration at a predetermined position of the float, and a thermostat located within the case to make contact With and operate said float.

3. An operating mechanism for a low Water and heat indicator including a case adapted to be connected with a holder to receive liquid therefrom, a float Within the case, a contact movably mounted for operation by said float, an electrical conductor of an electric circuit positioned to be touched by said contact, and a thermostat positioned to move said float and therethrough to move said contact.

low Water and heat conditions 4. An operating mechanism for a low Water andv heat indicator including a case adapted to be connected with a holder to receive a liquid therefrom, a float Within the case, means actuated by the float to set an indicator in operation at a predetermined position of the float, and a thermostat positioned to cause operation of said float actuated means.

5. An operating mechanism for denoting including a case adapted to be connected with a liquid retainer to receive liquid therefrom, a float member within the case, and a thermostat member located within the case, said members being adapted to jointly cause operation of an indicator to denote one condition, and to cause operation of said indicator by one of said members independently of the other to denote another of said conditions.

OSCAR H. LUDEMAN. 

